Cardio Workout: 5 Moves to Build Endurance

Who says you need a treadmill to build endurance?

You've probably noticed that each of these workouts offers several modifications so you can adjust the level of difficulty to suit your needs. You can do three to five rounds of the exercises, varying the length and difficulty of your workout, and you can rest between rounds for 60-90 seconds, varying your work-to-rest ratio.

Since you're now into Week 2, we suggest that you try to step up your routine in a small way. If you spent the first week doing three rounds and resting 90 seconds, maybe this week you do four rounds and rest 90 seconds between each round. Or, if you're short on time—stick to three rounds, and cut your rest between rounds to 60 seconds. We'll remind you to step things up each week so that this program remains challenging—and so you can accomplish your goals. Like the rest of our Challenge, today's cardio workout was created by Bianca Vesco, a certified personal trainer and group fitness instructor at NYSC Lab in NYC.

Jumping Jack

We're guessing you've seen these before. But just in case: Stand with your feet together, core engaged, and hands at sides.
-Jump your feet wider than hip-width apart, and bring arms up to clap hands overhead.
-Jump your feet back together and bring arms to sides to return to starting position.
-Repeat as quickly as possible, going for height and speed.